Answer:
-8 - -11 = 3
Step-by-step explanation:

Therefore, the missing number is -11
Answer:
C
Step-by-step explanation:

=16.7332
That is one side of the square, so multiply by 4
=66.93
<h2>Answer </h2>
The length of UC is 18
<h2>Explanation </h2>
First we are going to find the length of JN; then we are subtracting from it the length of JU plus the length of CN.
We can infer from our picture that JN is 82 + 105, so JN = 187
We can also infer that JU = JH + HU
JU = 22 + 96
JU = 118
We can also infer that CN = 51
Now we can fin the length of UC:



We can conclude that the length of UC is 18.

because

is a set with the element 0, so it's not the empty set, while

is the empty set.